RHEL 6 : krb5 (RHSA-2011:0200)

Updated krb5 packages that fix three security issues are now available
for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS)
base scores, which give detailed severity ratings, are available for
each vulnerability from the CVE links in the References section.

Kerberos is a network authentication system which allows clients and
servers to authenticate to each other using symmetric encryption and a
trusted third-party, the Key Distribution Center (KDC).

A NULL pointer dereference flaw was found in the way the MIT Kerberos
KDC processed principal names that were not null terminated, when the
KDC was configured to use an LDAP back end. A remote attacker could
use this flaw to crash the KDC via a specially crafted request.
(CVE-2011-0282)

A denial of service flaw was found in the way the MIT Kerberos KDC
processed certain principal names when the KDC was configured to use
an LDAP back end. A remote attacker could use this flaw to cause the
KDC to hang via a specially crafted request. (CVE-2011-0281)

A denial of service flaw was found in the way the MIT Kerberos V5
slave KDC update server (kpropd) processed certain update requests for
KDC database propagation. A remote attacker could use this flaw to
terminate the kpropd daemon via a specially crafted update request.
(CVE-2010-4022)

Red Hat would like to thank the MIT Kerberos Team for reporting the
CVE-2011-0282 and CVE-2011-0281 issues. Upstream acknowledges Kevin
Longfellow of Oracle Corporation as the original reporter of the
CVE-2011-0281 issue.

All krb5 users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the
updated packages, the krb5kdc daemon will be restarted automatically.

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